Thanks for all the responses.

I've already got a means of getting the CAT5 up to the loft. However, the UPS is up there, so having the ONT on the UPS as well might be useful. Also, the cable terminates in a teenager's bedroom (that room was the computer room before he turned up!) so I thought moving it all out would be safer too.

I did ask them to install in the loft, both to the ISP before install, and to the installers when they arrived. Both received a flat 'no', without even looking up there. The loft is boarded down the centre and has light up there (although it's not brilliant) and has a fixed ladder for access. It would have been a lot simpler cable run for them (just straight up the front of the house, then routed through the loft), but they wouldn't even consider it.

If the ONT is registered with the provider (i.e. I can't just plonk my own in) then it's probably just as easy to leave it as-is.

Thanks.

Andy

You could use Power Over Ethernet (POE) to power the ONT from the loft UPS.

In reply to a post by skandia2:

You could use Power Over Ethernet (POE) to power the ONT from the loft UPS.

That's an interesting idea. So the ethernet port on the ONT will receive power via POE?

I think I have a PoE injector I could use to provide power, that might be worth a try.

Andy

You'd have to use a PoE splitter at the other end to break the power back out - the ONT ethernet port doesn't support PoE. But it would allow you to power it from your central UPS.

The ONT will need an external POE splitter.
Maybe one like https://www.amazon.co.uk/Splitter-Compliant-Surveill...
These typically need a 48V PSU at the Inject end.

The ONT won’t need 48v though so you’d need a regulator to step down the voltage to 12v.

I used this so my ONT was powered from a UPS in another location.
Works well and the power output connector is the perfect size for the ONT and can be set to 12V

TP-Link Injector
TP-Link POE Splitter

Maybe missing something here - but if you want to move the ONT surely you will need more fibre optic cable which I am assuming is more expensive than Cat6.

And if you have the skill/knowledge to relocate an ONT then it will be far simpler to just lay Cat6 cable to the desired location ? And that would have exactly the same end result at a lot less cost ?

Yes, you're missing the answer gave this morning that covered this - See here